WASHINGTON — The Biden administration moved on Monday to reimpose financial sanctions on an Israeli mining executive who had turned to a team of lobbyists to have the measures eased during President Donald J. Trump’s final days in office.
The reversal came after a chorus of complaints from human rights advocates, members of Congress and activists in the Democratic Republic of Congo, where the businessman, Dan Gertler, secured access to mining rights for decades through what the Treasury Department during the Trump administration called a series of corrupt deals that had shortchanged Congo of more than $1.3 billion in revenue from the sale of minerals.
In mid-January, shortly before Mr. Trump left office, Mr. Gertler secretly secured a one-year Treasury Department license that unfroze money he had deposited in financial institutions in the United States. The license also effectively ended a prohibition on Mr. Gertler doing business through the international banking system. The Trump administration had imposed those sanctions in 2017.
The Biden administration is now moving to reimpose those conditions, although Mr. Gertler is likely to have already moved at least some of the previously frozen money out of the United States.
Alan M. Dershowitz, a lawyer and lobbyist who helped represent Mr. Gertler in the push for the rollback of the sanctions, said he was disappointed with the Biden administration’s action.
“This decision was done unilaterally without an opportunity for Mr. Gertler to present evidence that he has been complying with all the requirements and conducting himself properly,” Mr. Dershowitz said. “We are now in the process of considering all of our options.”
Mr. Gertler has been doing business in Congo for more than two decades, securing a series of contracts to export diamonds, gold, oil, cobalt and other minerals. The Treasury Department said in 2018 that he had “amassed his fortune through hundreds of millions of dollars’ worth of opaque and corrupt mining.”
more than a dozen that had called on the Biden administration to revoke the license. “Dan Gertler’s corrupt partnership with former President Joseph Kabila cost the D.R.C. dearly in terms of lost resources, lost services and, ultimately, lost lives.”
In 2019, Mr. Gertler hired Mr. Dershowitz, who has served as a lawyer to Mr. Trump, as well as Louis Freeh, a former F.B.I. director, to work as a lobbyist to try to push Treasury to revoke the sanctions.
Mr. Gertler was issued the license after Treasury Secretary Steven Mnuchin directed the acting head of the agency’s Office of Foreign Assets Control to take the step, even though several Trump-era State Department officials in charge of United States relations with Africa told The New York Times that they had been unaware that such a move was about to be taken and that they opposed it.
After the issuance of the license became public, associates of Mr. Gertler said that part of the reason he had been granted special treatment was that he had played some undisclosed role in helping U.S. national security interests. Treasury officials and representatives for Mr. Gertler would not describe the specific nature of the assistance.
The same office at Treasury that had granted the license for Mr. Gertler in January revoked it on Monday, yet another sign of how unusual this series of events has been.
Activists in Congo who have been working for years to try to ensure that the wealth produced by mining minerals in the nation — which is one of the poorest in the world, even though it has some of the world’s most important mineral reserves — said they hoped the action would mean continued progress to combat corrupt deals that shortchanged people there.